Metamorphous sal-ammoniac



UNITED STATES PATENT OFFICE.

CARL PFANSTIEHL, F HIGHLAND PARK, ILLINOIS, ASSIGNOR TO SPECIAL CHEMICALS COMPANY, A CORPORATION OF ILLINOIS.

METAMORPHOUS SAL-AMMONIAC, (AMMONIUM CHLORID.)

No Drawing.

To all whom it may concern:

Be it known that I, CARL PFANSTIEHL, a citizen of the United States, residing at Highland Park, in the county of Lake and State of Illinois, have invented or discovered a Metamorphous Sal-Ammoniac, (Ammonium Chlorid,) of which the following 1s a specification.

If pressure of several tons per square inch (preferably from to tons) is applied to the ordinary crystalline or sublimed form of sal ammoniac or ammonium chlorid (NILCl) the original crystals flow together producing a new material of the same chemical properties but of a new physical form. The metamorphous sal ammoniac is white or grayish in color, more or less translucent (the transluoence being greater if the crystals are powdered before the pressure is applied), quite dense and strong so that a severe blow is required to fracture a block inch thick, and has a smooth surface texture. The surface can be scratched easily with a knife and sharp edges or pro- 'ections can readily be cut or scraped off.

he most noticeable identifying mark of the metamorphous material is that it has the characteristic appearance of the natural metamorphous rocks which have been re- Specification of Letters Patent.

Patented Apr. 20, 1920.

Application filed February 19, 1919. Serial No. 278,048.

crystallized by pressure, its resemblance to marble and quartzite being striking. A smooth block looks like a fine-grained smooth piece of white marble, and the fracture is very similar to that of white marble. The metamorphous sal ammoniac, owin to its physical form, is highly suited for in ustrial use to replace the crystalline or sublimed forms, and particularly for tinners use.

I claim as new:

1. The herein-described metamorphous sal ammoniac (ammonium chlorid) in the form of a solid mass of white or grayish color and having the characteristic appearance and fracture of marble.

2. Sal ammoniac (ammonium chlorid) metamorphosed by pressure in the form of a solid mass having the characteristic appearance and fracture of marble.

3. The method of making metamorphous sal ammoniac (ammonium chlorid) consisting in the application of pressure suflicient to cause the crystals to flow together and form a solid mass having the characteristic ap earance and fracture of marble.

n testimony whereof I have hereunto set my hand this 17th da of F ebruar 1919. CA L PFANS IEHL. 

